Adopted: January 18, 1957
The state flag is the same with the arms of the Land in the middle. The blue-white-red flag of Schleswig-Holstein dates from 1844 and the colors were taken from the coat of arms of Schleswig and Holstein. Because the flag was used by pro-German movements while under the rule of Denmark, the flag was banned by Danish authorities in 1845. Schleswig-Holstein became a province of Prussia in 1867 and was under German rule, but the blue-white-red was never legally adopted until 1957, after having been in unofficial use since 1948.